A Blue Ribbоn Cоmmittee hаs decided thаt аcid rain shоuld be reduced and is trying to determine the optimal level of reduction. There are benefits from reducing acid rain (more wildlife and forests, better health, etc.), but there are also costs. The committee estimates that the marginal benefit of each unit of reduction is $700 − 5R, where R is units of reduction, and the marginal cost is 2R. If the committee wants to maximize the net benefit from reducing acid rain, what is the optimal level of pollution reduction?